Cap-assisted endoscopy increases ampulla of Vater visualization in high-risk patients by Leonardo Correa Silva, Rondinelle Martins Arruda, Paula Fortuci Resende Botelho, Leonardo Nogueira Taveira, Kelly Menezio Giardina, Marco Antonio de Oliveira, Julia Dias, Cleyton Zanardo Oliveira, Gilberto Fava, Denise Peixoto Guimarães

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